1987 comanche engine turns over wont start - JeepForum.com

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post #1 of 5 Old 01-13-2013, 04:50 PM Thread Starter
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1987 comanche engine turns over wont start

hi every one im new here im a wrench on motorcycles i own an 87 comanche about 160,000 miles went to pick something up a week ago ran fine there loaded up the truck turned the key would spin and try to start but no luck ..will run on spray...so i towed it home 3 hours later i tried it and it started ...today we replaced the fuel pump with correct bosch unit the pump will run for a few seconds and turn off but i have no fuel out of the tank relay is new as is filter remember it will run on spray im missing something need my truck back any ideas thanks bob

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post #2 of 5 Old 01-13-2013, 05:32 PM
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1990 MJ Comanche 
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Location: Guston
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Is it getting fuel to the fuel rail?

Is the fuel pump running? The ground on the back is a known issue.
It is behind one of the tail lights and is a small wire attached to the bed. Take it off, clean it and lightly sand it and where it connects and reattach.

Get over to comancheclub.com.

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post #3 of 5 Old 01-13-2013, 05:45 PM Thread Starter
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pump runs ill thats in the post no fuel out of tank yes theres gas in it i just noticed it will crank in park but not in neutral been a long unproductive day
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post #4 of 5 Old 01-15-2013, 06:58 PM
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1989 MJ Comanche 
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Location: north bay/corbeil
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one thought, it happened to me after replacing my tank... the new pump... did you replace the hose on the pump to sending unit and clamp it... i didnt and the hose split and just pumped fuel inside the tank and not out the sending unit..
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post #5 of 5 Old 01-22-2013, 04:32 AM
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1990 MJ Comanche 
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Location: Prescott
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There is possibly a fuel pump ballast resistor on your driver's side inner fender. White ceramic, wire to each end, bolt through the middle. Make sure connections are tight. It's OK to bypass it.
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